What is the state of matter for 2NH3, 2NaCl and 2KNO3+PBI2.

How many joules of heat are absorbed to raise the temperature of 650 grams of water from 5.00c to it's boiling point, 100c

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?